The man did not show a weapon but threatened that he had one, Costa Mesa police Sgt. Matt Grimmond said at the time.

During Tuesday's robbery, the suspect pulled out a handgun, pointed it at a female teller and demanded that she fill a bag with money, according to a news release from police. The suspect forced a second teller to do the same.

The robber then demanded that workers open the bank's vault and produce large bills, according to a bank employee who asked not to be named, citing uncertainty about Citibank's policy.

When the workers said they didn't have access to the vault, "that's when [the robber] got frustrated and annoyed and left the scene," the employee said.

The suspect fled through doors on the bank's west side and ran east toward an apartment building, police said.